1Blurb:: 2Gradients are needed and will be obtained from a mix of numerical and 3analytic sources 4 5Description:: 6The \c mixed_gradients specification means that some gradient 7information is available directly from the simulation (analytic) 8whereas the rest will have to be finite differenced (numerical). This 9specification allows the user to make use of as much analytic gradient 10information as is available and then finite difference for the 11rest. 12 13The \c method_source, \c interval_type, 14and \c fd_gradient_step_size specifications 15pertain to those functions listed 16by the \c id_numerical_gradients list. 17 18Topics:: 19Examples:: 20For example, the objective function may be a simple analytic 21function of the design variables (e.g., weight) whereas the 22constraints are nonlinear implicit functions of complex analyses 23(e.g., maximum stress). 24 25Theory:: 26Faq:: 27See_Also:: responses-numerical_gradients, responses-no_gradients, responses-analytic_gradients 28